package com.yc.demo.d0301;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet(name = "GetDataServlet", value = "/GetDataServlet")
public class GetDataServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");

        // 获取请求对象中的数据
        // 请求中的数据，只在请求对象的有效期之内有效
        final Object data = request.getAttribute("data");

        // 获取会话中的数据
        // 会话在多个请求中一直有效 => 同一个会话对象
        final Object data1 = request.getSession().getAttribute("data");

        final PrintWriter out = response.getWriter();

        out.printf("请求中的数据data : %s <br />", data);
        out.printf("会话中的数据data : %s <br />", data1);
        out.printf("会话id : %s <br />", request.getSession().getId());
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}
